title: Large photoconductivity of oxygen-deficient La(0.7)Ca(0.3)MnO(3)/SrTiO(3) heterostructures.
abstract: The electrical resistance of stoichiometric and oxygen-deficient epitaxial 10 nm thick La(0.7)Ca(0.3)MnO(3) thin films on SrTiO(3) under photoexcitation covering the visible to the ultraviolet range has been investigated systematically as a function of illumination intensity, wavelength and temperature. In contrast to as-prepared films, the oxygen-deficient samples exhibit large photoconductivity of several orders of magnitude at low temperatures. By our detailed comparative analysis of the electrical conductivity of the film/substrate heterostructure and the bare substrate we are able to elucidate contributions of both carrier generation in the film and carrier injection from the substrate to the observed effect.
authors.affiliation: Institute of Applied Photophysics, Technische Universität Dresden, D-01062 Dresden, Germany. elke.beyreuther@iapp.de
authors.forename: E
authors.initials: E
authors.lastname: Beyreuther
authors.forename: A
authors.initials: A
authors.lastname: Thiessen
authors.forename: S
authors.initials: S
authors.lastname: Grafström
authors.forename: K
authors.initials: K
authors.lastname: Dörr
authors.forename: L M
authors.initials: LM
authors.lastname: Eng